2 z 2*z -- + --- + 1 2 t t z ------------ + - t t
2 z 2*z 1 + -- + --- 2 t z t - + ------------ t t
z/t + (1.0 + z^2/t^2 + 2.0*z/t)/t
/ 3 2 2\ 4 t*\t + t*z + 2*z*t / + z*t ----------------------------- 5 t
2 2 t + z*t + z*(z + 2*t) ----------------------- 3 t
2 2 2 t + z + z*t + 2*t*z ---------------------- 3 t
2 z 2*z 1 + z + -- + --- 2 t t ---------------- t
2 2 2 t + z + z*t + 2*t*z ---------------------- 3 t
2 2 2 t + z + z*t + 2*t*z ---------------------- 3 t